When I was in first grade, we had a kid who, today, would probably be segregated from other students.
He was always a problem, but one day he absolutely melted down.
I'm not talking about a crying tantrum, I'm talking about a full-blown psychotic break with a shockingly high level of energy and violence. Scrawny little 6 year old shouldn't be a problem for a full-grown teacher, right?
Wrong.
This kid was so uncontrollably violent he put our teacher and another student in the hospital overnight. The teacher tried to grab him to, I guess, calm him down. He broke loose as if it was nothing, picked up his desk chair and threw it at her. I'm not talking about those new light-weight plastic desks and chairs they have now. These were the old stamped/tubular steel chair/desk that even for an adult weighs one hell of a lot.
The chair hit her and bounced into another kid. He then picked up his desk and threw it, too. Luckily that missed. He then proceeded to start smashing the windows with his fists.
I can't remember if a student ran to another room to get a teacher or what, but one of the men teachers came in and tried to grab this kid, Bobby I think was his name, broke that guy's nose. It took three teachers to fully subdue this kid and he was still struggling like a wildcat.
There was blood everywhere, from my teacher's cuts, from Bobby's shredded hands, and from the other teacher's broken nose.
Had Bobby had a knife, or even a shard of glass from one of the windows that he shattered, I have no doubt that the situation would have been a LOT worse.
Never saw the kid again.